* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

ul,
ol {
    list-style: none;
}

.box {
    padding: 50px;
    width: 1200px;
    height: 700px;
    margin: 100px auto 0;
    background: #999;
    display: flex;
    justify-content: space-between;


}

.left {
    width: 500px;
    height: 600px;
}

.right {
    width: 500px;
    height: 600px;

}

.left ul {
    padding-top: 50px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;

}

.left ul li {
    width: 30%;
    height: 150px;
    background: #ccc;
    margin-bottom: 20px;
    text-align: center;
    line-height: 150px;
    font-size: 40px;
    font-weight: 900;

}

.right {
    display: flex;
    flex-direction: column;
    justify-content: center;



}

.right .range {
    width: 400px;
    margin: 0 auto;
}

.right .name {
    width: 300px;
    height: 100px;
    background: #666;
    margin: 0 auto 60px;
    text-align: center;
    line-height: 100px;
    font-size: 30px;
    font-weight: 900;
}

.right .btn {
    margin: 60px auto;
    font-size: 30px;
    font-weight: 900;

}

.right .btn div {
    width: 100px;
    height: 40px;
    background: #666;
    border: 3px solid #000;

}

.right .btn div:after {
    content: "";
    display: block;
    width: 47px;
    height: 34px;
    background: blue;
}


.active:after {
    margin-left: 47px;
}